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Picture library: 2004768

Ceratocystis ulmi. A group of wasps seeking sap from this diseased tree.

Reference: 2004768

Ceratocystis ulmi. A group of wasps seeking sap from this diseased tree.
Date Taken: 15th September 1976

Photographer: T. K. Evans
Copyright: Crown Copyright
Credit line: Forestry Commission / T. K. Evans

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